Lifting-magnet.



PATENTED MAY 29, 1906.

C. E. F. AHLM. LIFTING MAGNET.

APPLICATION FILED AUG. 28, 1905 Witvidu 6W5. zfwwr Jazz CHARLES E. F. AliLli i, 0F (JLEVELALN 'l), OHIO, Atitiliiliilli TO {l A {MATURE WORKS, 0F CLEVELAND, Uilib, i-i PA lt'itliilh i isrine iiimeuisr.

Specification of Letters Patent.

Fatenter To all whom it 10mg, concern.-

Be it known that l, CrrARLEs E. F. AHLM, a citizen of the United States, residing at Cleveland, in the county of (luyehoge and State of Ohio, have invented a certain new and useful Improvement in Li'fting lilagnets, of which the following is a full, clear, and 031-- not description reference being had to the accompanying drawings.

This invention relates to certain improvements in lifting-magnets designed to he used in loading and unloading and transferring pig-iron, sheet-steel, scrap, and articles copahle of magnetization.

In lifting articles of s. fiat or plate-like ch aracter it has been found that the ordin er y magnets are usually of on insufiicient diameter or when ofsuiiicient diameter the poles are so Widely sepereited that the reluctance is so great taste cause the magnetic flux to he weakened, and by conse uence the benefit of the increased diameter 0 the magnet is lost.

I have designed e magnet involving prin @1- ples of construction which eliminate the defects above noted and which is by reason of its particular arrangement more efficient and economical in actual use. in the accompanying drawings, Figure 1 is a vertical cross-section. of the type of magnet which I employ for lifting fiat sheet-like rirticles. Fig. 2 is a plan view of the some.

Referring to the figures, it will he seen that the frame A of the magnet, which is a piece of metal of high magnetic permeability, is, as shown in Fig. l provided with two annular concentric magnetic coils B and (7, held in grooves in the same plane on its lower face by retaining-rings B (1 and strips B 0 prefernhly of brass or some equivalent material. These coils are in parallel and so wound that the central pole-piece A and the outer mine lar pole-piece A are of the some polarity, While the intermediate annular pole-piece A is of the opposite polarity. By this arrange ment the magnetic ilux lows evenly and strongly from the intermediate pole toward the poles on each side thereof, thus having the flux extend over it great distance with the intensity usual upon it short distance. This .gives the lilting-magnet at capacity for taking hold over it greater area oi the material to he lifted end netisl'uctorily solves the problem 'ellel, and their terminals llllitVilW' plurality of pole-pieces d heretofore presented hv the increased reluctance. The separate coils wound in par re protected by means of a casing it, integral with the frame and having a covering A of mice or siinilztr i'nstcrial. The frame A. is provided with the usual eyeholts A. it will. o be obvious that. this construction n1 lerged indefinitely, since I moy ext frame and provide a third coil, Whic shell he so Wound that its outer pole-piece shall he oi the some polarity us the iole-piccc lietwecn. the first two coils. This is simply to i development of the principle which I ll. shown and not it departure therefrom.

My reason for connecting up the coils in parallel instead of in series is to obtain it certain nio-nipur 've advantage Whenever smell articles, costings, ere hendl When such material is ll-I'zlli erred to the point of disclnu'gc, either the ue lot may he dropped at once by opening in. circuits oi all the coils at the same time or the material may he dropped gradually by opening th circuits of each coil successively, heginning with the outer coil This lett rocedure may he used to advantage whe. to distribute the material handled.

i. A lifting-magnet comprising s top plate e mending thereironi and a, plurality of coils on depending pole-pieces and create at number of magnetic poles in. Mi at the nuniher of coils.

2. A lifting-magnet cornprisiiiq top plate having pole-pieces dc iending therefrom and o plurality of coils arranged on said depend ing; pole-pieces and wounl to crests pro cell concentric zones of rnitgnetii': poles, the alternate zones being of the ne polarity.

3. A liitinggg-nmggnet roinpri i it top pie having polwpieces depending; therefrom dis posed around a center and so arranged that a, radial line from the center of the magnet outward will cut at least three polar faces, the Winding for the pole-pieces arranged on said depending polwpieces and wound to have at leastone less coil then the number of polcpier-es.

4. A lii't mgr-magnet comprising 3, top plate having pole-pieces depending; therefrom disw d that a v poseduround :1. cents? 22 mam] lme 0m 5. 7A 3 mfmpelss soma 0i e mailers, 1.

4-: eia'me hithcm and at the nun-baa m soils.

6. A lifting-magnet suing a succession of at east thme pole-pieces, Que ole-piece being encircled by the others am? coils Wound 00 cause the lines of force of each po1e-piece ta paras to 01 from the adjacent pole-piece.

in testimony whereof I hereunto ai'fix my Signature in the presence of two witnesses. CHARLES E. F. AHLV.

W itness sz w J. M. Noon-WARD, ALBERT Hv BATES. 

